[PATCH] ps3: always make sure we're running on a PS3

[Geoff Levand]

Geert Uytterhoeven wrote:
> Add missing checks to PS3 specific drivers ps3av and sys-manager to verify that
> we are actually running on a PS3 (pointed out by Arnd).
> 
> Correct existing checks in other subsystems/drivers to return -ENODEV instead
> of zero.
> 
> Signed-off-by: Geert Uytterhoeven <Geert.Uytterhoeven at sonycom.com>

Paul, please apply.

Acked-by: Geoff Levand <geoffrey.levand at am.sony.com>